Interest Rate Swap (Details) - USD ($) $ in Thousands				12 Months Ended
	Feb. 19, 2021	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Asset		$ 2,817		$ 2,817
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion				2,283	$ 0	$ 0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax				891	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax				0	0	0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred		400
Fair Value, Option, Changes in Fair Value, Gain (Loss)				1,392	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax				0	0	0
Derivative Instruments, Loss Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing				534	0	0
Other Short-term Borrowings					0	0
Interest Rate Swap, Inception Date			Mar. 31, 2016
Derivative Liability, Notional Amount		190,000	$ 197,500	190,000
Other Comprehensive Income (Loss), Net of Tax				1,392	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax		1,392		1,392	0	0
Interest Rate Swap Short Term Portion [Member]
Derivative [Line Items]
Other Short-term Borrowings		(398)		(398)	0	0
Interest Rate Swap Long Term Portion [Member]
Derivative [Line Items]
Other Short-term Borrowings					0	0
Derivative Asset		$ 3,215		$ 3,215
Beginning Balance [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax					$ 0	$ 0	$ 0
Subsequent Event [Member]
Derivative [Line Items]
Interest Rate Swap, Maturity Date	Feb. 19, 2021